Neden kimse Türkçe yazmiyor mi? soru Turkce yazilmıştir
You need to use either the question word (neden/why) or the yes/no question marker mI, they can't be together.
Thank you very much for explaining that to me, what about where in English you can write, "why did/didn't don't won't you (x) ?" .. with a question mark at the end for writing. But not necessary in speaking. This is what confuses English speakers..